<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>06_列表渲染2</title>
</head>
<body>
<!--
1. 列表过滤
2. 列表排序
-->

<div id="test">
    <input type="text" v-model="searchName"/>
    <ul>
        <li v-for="(p, index) in filterPersons" :key="index">
            {{index}}---{{p.name}}--{{p.age}}
        </li>
    </ul>
    <button @click="setOrderType(1)">年龄升序</button>
    <button @click="setOrderType(2)">年龄降序</button>
    <button @click="setOrderType(0)">原本顺序</button>
</div>

<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
    const vm = new Vue({
        el: '#test',
        data: {
            searchName: '',
            orderType: 0,//0代表原本，1代表升序，2代表降序
            persons: [
                {name: 'Limi', age: 35},
                {name: 'Kaysen', age: 5},
                {name: 'Hamey', age: 34},
                {name: 'Kely', age: 4}
            ]
        },
        computed: {
            filterPersons () {
                //取出相关的数据
                const {searchName, persons, orderType} = this
                //最总需要显示的数组
                let fPersons;
                //对persons进行过滤
                fPersons = persons.filter(p => p.name.indexOf(searchName)!==-1)
                //排序
                if (orderType !== 0) {
                    fPersons.sort(function (p1, p2) {//如果返回负数p1在前，返回正数p2在前
                        // 1代表升序，2代表降序
                        if (orderType === 2) {
                            return p2.age - p1.age
                        } else {
                            return p1.age - p2.age
                        }
                    })
                }

                return fPersons
            }
        },
        methods: {
            setOrderType (orderType) {
                this.orderType = orderType
            }
        }
    })
</script>
</body>
</html>